JPH07172152A - Cooling unit and drain case for air conditioning device - Google Patents

Abstract

PURPOSE:To prevent any local corrosion at the lower end part of a refrigerant carrier conduit by preventing retention of condensed water at the lower end part of the refrigerant carrier conduit. CONSTITUTION:A drain case 4 is sandwiched between the bottom wall of an unit case and the lower end part of the refrigerant carrier conduit 15 of a build-up-type refrigerant evaporator. The drain case 4 which has a W shaped cross-sectional configuration is constructed with two external side slant walls 32 in contact with the side ends of two tank parts 16, 17 formed at the lower end part of the refrigerant carrier conduit 15, an angle shaped projecting wall 33 in contact with a recessed part 28 formed at the lowest end parts between adjacent two tank parts 16, 17, and an internal side slant wall 34 to form a drainage hole 36; and the like. Condensed water which flows and falls from the side ends of two tank parts 16, 17 and positions of two tank parts 16, 17 to the lower end parts thereof flows along the two external side slant walls 32 and the projecting wall 33 of the drain case 4 before arriving at the lowest ends of two tank parts 16, 17, thereby the condensed water is effectively drained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a drainage case suitable for efficiently draining condensed water generated on the surface of a refrigerant evaporator housed in a unit case from the core surface. Related to the cooling unit, especially the drainage case used for the cooling unit of the air conditioner.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 26 and 27, for example, an air conditioner in which a refrigerant evaporator 102 is housed in a recess 101 of a unit case 100 which forms a duct for blowing air indoors. The device is known. Then, the bottom wall of the recess 101 is opened below the refrigerant evaporator 102, and the drainage port 10 for discharging the condensed water adhering to the surface of the refrigerant evaporator 102 to the outside of the unit case 100.
3 is formed.

Further, conventionally, in the refrigerant evaporator 102, as shown in FIG. 28, a refrigerant passage pipe 104 and two tank portions 105 are integrally formed on the end side of the refrigerant passage pipe 104. A plurality of paired molding plates 106 are laminated. Further, the core portion 107 of the refrigerant evaporator 102 is configured such that fins 108 are interposed between the adjacent refrigerant flow path pipes 104.

The air-side heat transfer surface (condensed water adhering surface) of the refrigerant evaporator 102 is composed of the surface of the fin 108 and the surface of the refrigerant flow pipe 104. As shown in FIG. The condensed water adhering to the surface of 108 is the fin 10
8 to the side of the refrigerant flow pipe 104. Also, FIG.
As shown in FIG. 0, an inclined rib 109 for improving the heat transfer coefficient on the refrigerant side is formed on the surface of the refrigerant flow pipe 104 in a convex state (a concave shape on the air side heat transfer surface). The condensed water flows toward the lower end side of the core portion 107 along the inclined ribs 109. According to the drainage principle as described above, the condensed water adhering to the surfaces of the fins 108 and the surface of the refrigerant flow pipe 104 is drained to the lower end side of the core portion 107. Reference numeral 113 is a burr portion for preventing the fin 108 from buckling.

There are two types of surface treatments for the refrigerant flow pipe 104 and the fins 108, which are composed of the pair of molding plates 106: hydrophilic treatment and water-repellent treatment, and hydrophilic treatment is generally performed in the past. ing. The reason for this is that there is still no treatment liquid for water repellent treatment that can withstand the environment in which the refrigerant evaporator 102 is used. Further, when the surface of the refrigerant flow pipe 104 or the fins 108 is subjected to a water repellent treatment, the fins 108
31 and water droplets are generated on the surface of the refrigerant flow path pipe 104.
As shown in FIG.
In 8, the water droplets are repelled between the louvers 110 and stagnant, and do not fall downward from the surface of the fin 108,
This is because water splashes on the leeward side of the unit case 100.

On the other hand, when the surface of the refrigerant flow pipe 104 or the surface of the fin 108 is subjected to hydrophilic treatment, a water film is formed on the surface of the refrigerant flow pipe 104 or the surface of the fin 108, and It will play a role in assisting the drainage principle of. As a result, a water film having a thickness of about 0.1 mm is formed on the upper end side of the core portion 107 due to the influence of the hydrophilic treatment.
No extreme retention occurred. Further, the refrigerant evaporator 102 in which the two tank portions 105 as shown in FIG. 26 are formed on the upper end side of the refrigerant flow pipe 104 is sacrificed even if condensed water stays at the lower end of the refrigerant flow pipe 104. Due to the effect of the corrosion fins 108, the corrosion of the lower end side of the refrigerant flow pipe did not cause much problem.

[0007]

However, the refrigerant evaporator 102 in which the two tank portions 105 as shown in FIG. 27 are formed on the lower end side of the refrigerant passage pipe 104 is a refrigerant passage in which condensed water stays. Since the fin 108 is not provided on the lower end side of the pipe 104, the effect of the sacrificial corrosion fin 108 cannot be expected. Therefore, the refrigerant flow pipe 104 due to the retention of condensed water
The problem of corrosion on the bottom side of is being highlighted.

That is, as shown in FIGS. 32 and 33, at the lower end side of the core portion 107 and the lower end portion of the tank portion 105 of the conventional refrigerant evaporator 102, the refrigerant flow pipe 10 is provided.
The drainage of condensed water adhering to the surface of No. 4 and the surface of the fin 108 was poor, and there was a problem that the condensed water stayed. Further, such a refrigerant evaporator 102 is used in the unit case 1
When inserted in 00, for example, the unit case 10
0 and the lower end of the refrigerant evaporator 102 include water in the insulator 111, which further deteriorates the drainage performance of the refrigerant evaporator 102.

The reason for this is that, as shown in FIG.
Condensed water that has flowed from the leeward side end A of the lower end of each of the tank portions 105 is discharged along the unit case 100 along with the drain port 10.
3 easily flows, but the condensed water flowing from the windward end B of the lower ends of the two tanks 105 stays as a bridge of water droplets between the lower end of the tank 105 and the insulator 111. This is because (the retention unit 112).

The condensed water flowing from the center C of the lower end portion between the two tank portions 105 merges with the bridged water drops if it flows to the windward end portion B side of the lower end portions of the two tank portions 105. If it is retained (accumulation part 112) and flows to the leeward side end part A side of the lower end parts of the two tank parts 105 on the contrary, there is no guide for the condensed water to flow down, and the condensed water accumulates ( Retention section 114).

The water droplets retained in the retaining portions 112 and 114 are (water retention by surface treatment) + (structural water droplet difficulty)> (gravity applied to water droplets), and the water droplets are retained in the retaining portions. Held at 112, 114,
As the water drops grow, they fall downward.

As described above, the refrigerant evaporator 102 in which the two tank portions 105 are formed on the lower end side of the refrigerant flow pipe 104.
In the refrigerant flow pipe 104, the condensed water easily accumulates and the corrosion factor components (chlorine, NOx, etc.) in the atmosphere are easily concentrated.
There was a problem that the frequency of localized corrosion tends to be extremely high on the lower end side of the.

The present invention mainly relates to a refrigerant evaporator in which two tank portions are formed on the lower end side of the refrigerant flow pipe, and the refrigerant flow is prevented by preventing the condensed water from staying on the lower end side of the refrigerant flow pipe. An object of the present invention is to provide a cooling unit and a drainage case of an air conditioner capable of preventing local corrosion on the lower end side of a passage pipe.

[0014]

According to a first aspect of the present invention, a plurality of refrigerant flow passage tubes, each having two tank portions formed on the lower end side of the refrigerant flow passage tube, are stacked and adjacent to each other. A refrigerant evaporator having fins interposed therebetween, a windward sideward inclined portion arranged below the refrigerant evaporator and abutting against windward end portions of the two tank portions, and a leeward side of the tank portion. It has a leeward sideward slanting portion that comes into contact with the end portion, a projecting portion that comes into contact with the lower end portion of the site between the two tank portions, and a discharge hole for draining condensed water generated in the refrigerant evaporator. Adopted technical means with drainage case.

It should be noted that the two side wall portions which come into contact with the side edges on the windward side and the side edges on the leeward side of the two tank portions, and the side wall portions which are inclined downward from the side wall portions, and which are inclined toward the windward side side. Section and two outer inclined walls that form the leeward sideward inclined section, and a V-shaped protruding wall that abuts the lower end portion of the site between the two tank portions and forms the protruding portion. The drain case may be composed of two inner inclined walls connecting the two outer inclined walls and the projecting wall. Further, the discharge hole may be formed in the inner inclined wall.

Two side wall portions that abut on the windward side edge and the leeward side edge of the two tank portions, respectively.
Two inclined walls that incline downward from the side wall portions and form the windward sideward inclined portion and the leeward side lateral inclined portion, and extend above a connecting portion of these inclined walls, It may be constituted by a columnar wall which abuts on the lower end of the portion between the individual tank parts and forms the projecting part.

Two side wall portions abutting the side edges on the windward side and the side edges on the leeward side of the two tank portions, and the side wall portions inclined downward from these side wall portions, Two inclined walls forming the leeward side lateral inclined portion, a bottom wall portion that connects the lowermost ends of these inclined walls and is separated from the lower end portions of the two tank portions by a predetermined distance, and It may be configured by a columnar wall that extends upward from the center of the bottom wall portion, contacts the lower end portion of the portion between the two tank portions, and forms the protruding portion. Further, the discharge hole may be formed in the bottom wall portion.

The molded plate and the fins of the refrigerant evaporator may be subjected to hydrophilic treatment. Further, the lowest end of the interposition range of the fins interposed between the adjacent molding plates may be provided below the upper end of the drain case. Further, the drain case may be sandwiched between the lower end of the refrigerant evaporator and the bottom wall of the unit case, and the unit case may be provided with an engaging portion for positioning the drain case.

According to a tenth aspect of the present invention, there is provided a refrigerant evaporator in which a tank portion bulging outward from the other portion is formed on the lower end side of the refrigerant passage tube whose surface is hydrophilically treated, and the refrigerant. And a unit case having a drainage port for discharging condensed water below the evaporator, wherein either one of the refrigerant evaporator and the unit case is from the bottom end of the tank part or the side end of the tank part. A technical means having a guiding means for guiding condensed water to the drainage port was adopted.

The invention according to claim 11 is arranged below a refrigerant evaporator formed by stacking a plurality of paired molding plates each having two tanks formed on the lower end side of the refrigerant flow pipe, A discharge case for discharging condensed water generated in an evaporator, which comprises a windward sideward slant portion that comes into contact with windward end portions of the two tank portions, and a leeward side of the two tank portions. An leeward sideward inclined portion that abuts an end portion, a projecting portion that abuts a lower end portion of a portion between the two tank portions, and a discharge hole for draining condensed water generated in the refrigerant evaporator. The technical means having is adopted.

[0021]

According to the invention described in claim 1 and the invention described in claim 11, the condensed water generated on the surface of the refrigerant evaporator in which two tank portions are formed on the lower end side of the refrigerant flow pipe is Gravity descends and the two windward ends of the two tanks
The leeward end of each tank portion and the lower end of the portion between the two tank portions are reached. Then, the condensed water that has reached the windward end portions of the two tank portions flows into the drainage case along the windward sideward inclined portions and is then drained from the discharge holes. Also, the condensed water that has reached the leeward side end of the two tank parts,
After flowing into the drainage case along the leeward sideward slope, it is drained from the discharge hole. Further, the condensed water that has reached the lower end portion of the portion between the two tank portions flows into the drainage case along the protrusion and is then drained from the drain hole. As a result, condensed water does not stay at the lowermost ends of the two tank portions, and thus local corrosion on the lower end sides of the refrigerant flow pipes can be prevented.

According to the tenth aspect of the present invention, the condensed water generated on the surface of the refrigerant evaporator in which the tank portion is formed at the lower end side of the refrigerant flow tube whose surface has been subjected to the hydrophilic treatment is generated by gravity. Going down. Then, it flows into the guiding means from the lowermost end or the side end of the tank portion and is drained to the drain port of the unit case. As a result, condensed water does not stay at the lowermost end of the tank portion, and thus local corrosion on the lower end side of the refrigerant flow pipe can be prevented.

[0023]

EXAMPLE A cooling unit for an air conditioner according to the present invention will be described below with reference to a plurality of examples shown in FIGS.

[Structure of First Embodiment] FIGS. 1 to 4 show a structure of a first embodiment of the present invention, and FIG. 1 is a view showing a cooling unit of an automobile air conditioner. Cooling unit 1 of this automobile air conditioner
Is a unit case 2 that constitutes a ventilation duct for sending air into the vehicle compartment, a laminated refrigerant evaporator 3 that cools the air flowing in the unit case 2, and the unit case 2 and the laminated refrigerant evaporator 3. It has a drainage case 4 inserted between them.

The unit case 2 is, for example, a tubular body made of PP (polypropylene) resin, and has a ceiling wall 5 which is recessed upward in the upper part and a bottom wall 6 which is recessed downward in the lower part facing the ceiling wall 5. have. Further, the bottom wall 6 is inclined downward with respect to the horizontal direction, and a drain port 7 for draining the condensed water from the inside of the unit case 2 to the outside is formed at the lowest position.

FIG. 2 is a view showing the laminated refrigerant evaporator 3,
FIG. 3 is a diagram showing the laminated refrigerant evaporator 3 and the drainage case 4. This laminated refrigerant evaporator 3 has an expansion valve (not shown).
, A refrigerant block heat exchange section 9 for exchanging heat between the refrigerant, a joint block 8 for connection with the downstream side of the refrigerant and a suction side of a refrigerant compressor (not shown), and heat exchange between the refrigerant and air. Refrigerant air heat exchange section 10 and refrigerant refrigerant heat exchange section 9
And a refrigerant decompression unit (not shown) provided between the refrigerant and air heat exchange unit 10.

The joint block 8 has an inlet 11 through which the gas-liquid two-phase refrigerant flowing out of the expansion valve flows in, and an outlet 1 through which the refrigerant after heat exchange flows out to the refrigerant compressor side.
2 is provided.

The refrigerant / refrigerant heat exchange section 9 is formed by laminating a plurality of refrigerant flow path tubes 13 formed by a pair of thin plate-shaped forming plates by means such as brazing. The surfaces of the pair of molding plates are hydrophilically treated by depositing a precoat material (C513), a hydrophilic polymer, a hydrophilic porous material, or the like.

Refrigerant Refrigerant heat exchanger 9 has an inlet 1 inside.
1, an inlet-side refrigerant flow path (not shown) for sending the refrigerant from the refrigerant-air heat exchanger 10 to the refrigerant-air heat exchanger 10, and an outlet 12 from the refrigerant-air heat exchanger 10.
An outlet side refrigerant flow path (not shown) for sending the refrigerant to is formed so as to meander. The inlet-side refrigerant flow path and the outlet-side refrigerant flow path are arranged over a predetermined distance so that heat can be exchanged between the refrigerant flowing in the inlet-side refrigerant flow path and the refrigerant flowing in the outlet-side refrigerant flow path. It is placed in close proximity.

The refrigerant air heat exchange section 10 includes a corrugated fin 14 for improving heat exchange efficiency with the air and a refrigerant flow pipe 15 formed by a pair of thin plate-shaped forming plates by means such as brazing. It is formed by stacking a plurality of layers. The surfaces of the corrugated fins 14 and the pair of molding plates are hydrophilically treated by depositing a precoat material (C513), a hydrophilic polymer, a hydrophilic porous material, or the like.

The molded plate forming the refrigerant flow pipe 15 is formed by pressing a thin plate-shaped aluminum alloy, as shown in part in FIG. A tank portion 16 is formed on the windward side on the lower end side of the refrigerant flow path pipe 15, and the tank portion 1 is provided on the leeward side on the lower end side of the refrigerant flow path pipe 15.
7 are formed. The two tank portions 16 and 17 formed on the lower end side of the refrigerant passage pipe 15 are communicated with each other through the substantially U-shaped refrigerant evaporation passage 18 formed above them. , So as to be joined to the lower end side of the adjacent refrigerant flow path pipe 15 by means such as brazing, and bulges in a substantially bowl shape in the stacking direction. In addition, two tank parts 16 and 17
In each of these, substantially elliptical communication holes 19 and 20 for communicating with the adjacent refrigerant flow path pipes 15 are formed.

Refrigerant evaporation passages 18 of the plurality of refrigerant passage pipes 15
Together with the plurality of corrugated fins 14 constitute the core portion 21 of the laminated refrigerant evaporator 3. In addition, a large number of inclined ribs 22 are formed in the refrigerant evaporating flow path 18 so as to project the refrigerant widely in the entire width direction so as to project inward. Further, joining walls 23 and 24 for joining the pair of molding plates to each other by means such as brazing are formed at the central portion and the outer peripheral edge of the refrigerant channel pipe 15 so as to project inward. A burr portion 25 for preventing buckling of the corrugated fins 14 extends in the stacking direction of the plurality of refrigerant flow pipes 15 from the uppermost end of one of the pair of molding plates.

The drainage case 4 is the guiding means of the present invention, and is made of, for example, PP (polypropylene) resin and has a W-shaped cross section, as shown in FIGS. It is sandwiched between the bottom wall 6 and the lower end of the laminated refrigerant evaporator 3. This drain case 4
The lowermost end of the central portion of the refrigerant flow pipe 15 (13), the lateral ends of the two tank portions 16 and 17 (the windward end and the leeward end of the laminated refrigerant evaporator 3) to the drain port 7 of the unit case 2. The condensed water generated on the surface of the laminated refrigerant evaporator 3 is guided.

The drain case 4 has two side walls 31,
It is composed of two outer inclined walls 32, a V-shaped protruding wall 33, two inner inclined walls 34, and a closing wall 35 that closes these widthwise end portions. The two side wall portions 31 have an arc-shaped cross-section and close the lateral ends of the two tank portions 16 and 17 formed at the lower end side of the refrigerant flow pipe 15 (13) to allow the laminated refrigerant evaporation. It is a leakage prevention means for preventing air leakage on the lower end side of the container 3. Further, the inner side surfaces of the two side wall portions 31 are in contact with the side ends of the two tank portions 16 and 17, and the outer side surfaces thereof are in contact with the inner side surface of the bottom wall 6 of the unit case 2.

The windward outer side inclined wall 32 of the two outer side inclined walls 32 is the windward sideward inclined portion of the present invention.
The leeward inclined wall 32 is the leeward sideward inclined portion of the present invention. Further, the two outer inclined walls 32 are the two side wall portions 31.
Is inclined downward from the lower end of the unit case, and the lowermost end is in contact with the bottom surface of the bottom wall 6 of the unit case 2. The ridge wall 33 is
The protrusion of the present invention is in contact with the rectangular recess 28 formed at the lowermost end of the central portion of the refrigerant flow pipe 15 (13). In addition, the recessed portion 28 has two tank portions 1 adjacent to each other.
It is formed at the lowest end of the area between 6 and 17. The two inner slanted walls 34 are portions that connect the outer slanted wall 32 and the projecting wall 33, and each form a drain hole 36 for draining condensed water onto the bottom wall 6 of the unit case 2. In addition,
The drainage hole 36 is the drainage hole of the present invention, and is the drainage case 4
Is formed so as to be open at the lowermost end.

[Operation of First Embodiment] Next, the operation of this embodiment will be described with reference to FIGS. Here, FIG. 4 is a diagram showing a drainage principle of a technique (first embodiment) in which the drainage case 4 is brought into contact with the lower end of the laminated refrigerant evaporator 3, and FIG.
Is a diagram showing a drainage principle of a technology (first comparative example) in which the drainage case 4 is not arranged at the lower end of the laminated refrigerant evaporator 3, and FIG. 6 shows a conventional unit case 100 below the laminated refrigerant evaporator 3. It is the figure which showed the drainage principle of the technique (2nd comparative example) used.

In the laminated refrigerant evaporator 3 in which the surfaces of the corrugated fins 14 and the refrigerant flow tube 15 are hydrophilically treated, the air flowing in the unit case 2 and the refrigerant flowing in the refrigerant flow tube 15 exchange heat with each other. To cool the air. Then, when the air is cooled to the dew point temperature or lower by the laminated refrigerant evaporator 3, the moisture contained in the air is condensed and adheres to the surfaces of the corrugated fins 14 and the refrigerant flow pipe 15,
A water film of about 0.1 mm is formed on these surfaces.

The condensed water adhering to the surface of the corrugated fins 14 flows along the corrugated fins 14 toward the refrigerant passage pipe 15 side, and the condensed water adhered to the surface of the refrigerant passage pipe 15 is recessed from other parts. Inclined rib 22 and joint wall 2
It descends along 3, 24. And the refrigerant flow pipe 1
In the case of the first comparative example, the condensed water flowing down from the lateral ends of the two tank parts 16 and 17 and between the two tank parts 16 and 17 to the lower end side of the tank parts 16 and 17 in FIG. As shown in 5, there is no drainage case 4 or guide, so 2
The individual tank portions 16 and 17 stay at the lower ends (horizontal portions) A and B of the tank portions 16 and 17, respectively.

Further, in the case of the second comparative example, as shown in FIG. 6, the condensed water that has flowed down from the side end of the tank portion 17 to the lower end side easily flows along the bottom wall of the unit case 100. However, the condensed water that has flowed down from the side end of the tank portion 16 to the lower end side is bridged by water droplets between the tank portion 16 and the insulator 111, and the lower end of the tank portion 16 (horizontal portion).
Stay in A. And the two tank parts 16, 1
Condensed water that has flowed from between 7 to the lower end sides of the tank parts 16 and 17 is retained because it is held by being combined with the bridged water drops when flowing to the lower end side of the tank part 16.
When it flows to the lower end side of the tank, since it does not have a guide, it stays at the lower end (horizontal portion) B of the tank section 16.

On the other hand, when the W-shaped drainage case 4 is brought into contact with the lower ends of the plurality of refrigerant flow path pipes 15 as in the first embodiment, as shown in FIG. Condensed water that has flowed to the lower end side from the side end of the tank portion 17 and the side end of the tank portion 17 is transmitted to the side wall portion 31 of the drainage case 4 before reaching the lower ends of the tank portions 16 and 17, and the side wall portion 31 is inclined outward Wall 32 → drain hole 36 → bottom wall 6 through drain port 7
To be drained efficiently.

Condensed water that has flowed down between the two tank parts 16 and 17 to the lower end sides of the tank parts 16 and 17 reaches the ridge wall 33 of the drainage case 4 before reaching the lower ends of the tank parts 16 and 17. It is transmitted from this ridge wall 33 to the inner inclined wall 34 →
The water is drained efficiently from the drain hole 36 through the bottom wall 6 to the drain port 7.

[Effect of First Embodiment] Here, in FIGS. 7 and 8, (water retention amount) / (surface area) at each site in the vertical direction of the first comparative example and the first embodiment was investigated by an experiment. These are experimental data. As can be seen from FIG. 7, in the first comparative example, at the lower ends A and B of the tank portions 16 and 17,
It can be seen that local accumulation of condensed water occurs. On the other hand, in the first embodiment, as can be confirmed from FIG. 8, the local accumulation of condensed water is suppressed, so that the refrigerant flow caused by the corrosion factor components (chlorine, NOx, etc.) in the atmosphere is a factor. The occurrence of local corrosion on the lower end side of the passage pipe 15 (13) can be suppressed.

[Structure of the Second Embodiment] FIGS. 9 to 10 show the structure of the second embodiment of the present invention, which is a view showing a laminated refrigerant evaporator and a drainage case.

In the two tank portions 16 and 17 formed on the lower end side of the molding plate constituting the refrigerant flow pipe 15 of the laminated refrigerant evaporator 3 of this embodiment, the adjacent refrigerant flow pipe 1 is provided.
Circular communication holes 19 and 20 for communicating with 5 are formed, respectively. Further, the corrugated fins 14 interposed between the adjacent refrigerant flow path pipes 15 are, for example, brazed above the upper ends of the two tank portions 16 and 17 as shown by the alternate long and short dash line in FIG. It is joined by means.

In the drainage case 4 of this embodiment, the bottom wall 6 of the unit case 2 and the laminated refrigerant evaporator 3 are interposed via an insulator 73 made of a material such as styrene paper or peelite.
It is sandwiched between the bottom edge of and.

The drainage case 4 has two standing wall portions 74 arranged in parallel, two arcuate walls 75 inclined downward from these standing wall portions 74, and the bottom end of the central portion of the refrigerant flow pipe 15 (13). A relatively long dimension of the ridge wall 76 that abuts the groove-shaped portion 29 formed in, the two rows of bottom walls 77 that connect the arcuate wall 75 and the ridge wall 76, and the widthwise end portions thereof. It comprises a closing wall 78 for closing.

The outer surfaces of the two standing wall portions 74 are in contact with the inner surface of the bottom wall 6 of the unit case 2. Further, the two arcuate walls 75 block the lateral ends of the two tank portions 16 and 17 formed on the lower end side of the refrigerant flow pipe 15 (13). On the back surfaces of the two arc-shaped walls 75, two rows of edge portions 80 having a semicircular cross section are formed so as not to damage the insulator 73, and the two rows of edge portions 80 are formed on the unit case 2. It is fitted in a positioning groove 79 formed in the bottom wall 6.

These edge portions 80 are for positioning the laminated refrigerant evaporator 3 and the drainage case 4 with respect to the unit case 2, and prevent air leakage on the lower end side of the laminated refrigerant evaporator 3. It is a thing. A drainage channel 81 for draining the condensed water is formed between the bottom end of the laminated refrigerant evaporator 3 and the bottom wall 77. A plurality of drain holes 82 for draining the condensed water onto the bottom wall 6 of the unit case 2 are respectively provided in the two rows of the bottom wall 77 in the longitudinal direction.

[Operation of Second Embodiment] Next, the operation of this embodiment will be described with reference to FIGS. 9 and 10. Condensed water adhering to the surfaces of the refrigerant flow pipes 15 (13) and the surfaces of the corrugated fins 14 of the laminated refrigerant evaporator 3 passes through the inclined ribs 22, collects on the joint walls 23 and 24, and flows downward. . Then, the condensed water flowing down to the lower end side from the lateral ends of the tank portion 16 and the tank portion 17 is transmitted to the arc-shaped wall 75 of the drainage case 4 before reaching the lower ends of the tank portions 16 and 17, From the arcuate wall 75 through the bottom wall 77-> drain hole 82-> bottom wall 6 (insulator 73) to the drain port 7, the water is efficiently drained.

Condensed water that has flowed down between the two tank parts 16 and 17 to the lower end sides of the tank parts 16 and 17 reaches the ridge wall 76 of the drainage case 4 before reaching the lower ends of the tank parts 16 and 17. It is transmitted from this ridge wall 76 to the bottom wall 77 → the drain hole 82 → the bottom wall 6 (insulator 73) and the drain port 7.
To be drained efficiently.

[Effect of Second Embodiment] Here, in the shape of the drainage case 4 of the first embodiment, as shown in FIG. 11, it is necessary to provide the drainage flow path 83 below the laminated refrigerant evaporator 3. There is a possibility that the cooling unit 1 may become large in size when mounted, and the insulator 73 between the drainage case 4 and the bottom wall 6 of the unit case 2 may be damaged by the sharply pointed edge portion 84. , There was a possibility of breaking.

On the other hand, in this embodiment, by forming the cross section of the edge portion 80 in a semi-circular shape (obtuse angle), it is possible to solve the problem that the insulator 73 is damaged or torn. .

Further, the lower ends of the intervening ranges of the corrugated fins 14 interposed between the adjacent refrigerant flow passage pipes 15 are higher than the upper end faces of the two standing wall portions 74 of the drainage case 4 and the end face of the lower wall 2a of the unit case 2. Is also located below. As a result, the air flowing in the unit case 2 is relatively guided to the upper side of the laminated refrigerant evaporator 3, passes through the gap between the lower end of the laminated refrigerant evaporator 3 and the drainage case 4, and the refrigerant and the heat are removed. Almost no air leaks without replacement.

[Third Embodiment] FIG. 12 shows a structure of a third embodiment of the present invention, and is a view showing a laminated refrigerant evaporator and a drainage case.

In the drainage case 4 of this embodiment, the side wall portion 51 that closes the side ends of the two tank portions 16 and 17 of the refrigerant flow pipe 15 and the two inclined wall portions inclined downward from the two side wall portions 51. 52, a columnar wall 53 and the like extending above the connecting portion of these inclined walls 52 and abutting on a rectangular recess 28 formed at the lowermost end of the central portion of the refrigerant flow pipe 15.

[Fourth Embodiment] FIGS. 13 to 15 show the structure of a fourth embodiment of the present invention, and FIGS. 13 and 14 are views showing a laminated refrigerant evaporator and a drainage case. .

In this embodiment, grooves 66 and 67 for collecting condensed water dropped from the laminated refrigerant evaporator 3 are formed in the outer inclined wall 32 and the inner inclined wall 34 of the drainage case 4 by cutting or the like. There is. As shown in FIG. 15, the groove portions 66 and 67 are formed in a rectangular cross section.

In the case of this embodiment, even when the refrigerant compressor is off or the air conditioner switch is off, that is, when there is no growth of water droplets on the drainage case 4, the waterdrops on the drainage case 4 are in the grooves 66, 67. Collected in. As a result, the water droplets grow and are guided to the drainage port 7 through the drainage hole 36 and the bottom wall 6, so that the water is drained more efficiently than in the first embodiment.

[Fifth Embodiment] FIG. 16 shows a structure of a fifth embodiment of the present invention, and is a view showing a drainage case.

Grooves 66, 6 of the drainage case 4 of this embodiment
Around the periphery of 7, a gentle slope 68 is formed. Compared to the fifth embodiment, this embodiment can collect water droplets on the outer inclined wall 32 and the inner inclined wall 34 of the drainage case 4 in a wider range in the grooves 66 and 67.

[Sixth Embodiment] FIG. 17 shows a structure of a sixth embodiment of the present invention, and is a view showing a drainage case. In this embodiment, trapezoidal grooves 69 and flat portions 70 are alternately formed on the outer inclined wall 32 and the inner inclined wall 34 of the drainage case 4.

[Seventh Embodiment] FIG. 18 shows a structure of a seventh embodiment of the present invention, and is a view showing a laminated refrigerant evaporator and a drainage case. In this embodiment, a groove 72 having a rectangular cross-section is formed on the outer inclined wall 32 and the inner inclined wall 34 of the drainage case 4 so as to follow the flange 71 of the refrigerant flow pipe 13 of the laminated refrigerant evaporator 3. is doing.

[Eighth Embodiment] FIGS. 19 and 20 show the structure of an eighth embodiment of the present invention, which is a view showing a laminated refrigerant evaporator and a unit case. The drainage case 4 of this embodiment has two standing wall portions 74 arranged in parallel and two arcuate walls 7 inclined downward from these standing wall portions 74.
5, a ridge wall 76, a circular arc wall 75, and a ridge wall 76 of a relatively short size that come into contact with the rectangular recess 28 formed at the lowermost end of the central portion of the refrigerant flow pipe 15 (13). Two rows of bottom walls 77 that are connected to each other, and a closing wall 7 that closes these width direction end portions
It consists of 8 mag.

In this embodiment, similarly to the second embodiment, the insulator 73 is damaged by forming the edge portion 80 in a semicircular shape (obtuse angle).
Problems such as tearing can be resolved.

Further, the drainage channel 81 provided below the laminated refrigerant evaporator 3 has a small space without reducing the drainage efficiency of the condensed water from the laminated refrigerant evaporator 3, thereby reducing the drainage case. By reducing the height of the cooling unit 4, the cooling unit 1 as a whole can be downsized. The height of the drainage channel 81 depends on the surface treatment agent, but in the laminated refrigerant evaporator 3 that has been subjected to the hydrophilic treatment, if a gap a of 3 mm or more is secured, the laminated refrigerant evaporator 3 and the drainage case Condensed water does not stay between 4 and 4.

[Ninth Embodiment] FIG. 21 shows a structure of a ninth embodiment of the present invention, and is a view showing a laminated refrigerant evaporator and a unit case. The two bottom walls 85 of the drainage case 4 of this embodiment each have an arcuate curved surface.

[Tenth Embodiment] FIG. 22 shows a tenth embodiment of the present invention.
It is a figure showing the structure of the example and showing the laminated refrigerant evaporator and the unit case. The bottom wall 86 of the drainage case 4 of this embodiment has an arcuate curved surface so as to gently connect the two arcuate walls 75.

[Eleventh Embodiment] FIGS. 23 and 24 show the structure of an eleventh embodiment of the present invention, which is a view showing a laminated refrigerant evaporator and a drainage case.

The drainage case 4 of this embodiment includes two tank portions 16 and 17 of the refrigerant flow pipe 15 of the laminated refrigerant evaporator 3.
Side wall portion 41 that closes the side ends of the two side wall portions 41, two contact wall portions 42 that respectively contact the lowermost ends of the two tank portions 16 and 17 from the two side wall portions 41, and inner end portions of these contact wall portions 42. Two inclined wall portions 43 that are inclined further downward, bottom walls 44 that connect the lowermost ends of these inclined wall portions 43 and are separated from the lowermost end of the refrigerant channel pipe 15 by a predetermined distance, and their widths. It is composed of a closing wall 45 or the like that closes the end in the direction. A drain hole 46 for draining condensed water onto the bottom wall 6 of the unit case 2 is formed in the inclined wall portion 43 and the bottom wall portion 44.

In the case of this embodiment, as shown in FIG. 24, the condensed water flowing down to the lower end side from the side end of the tank portion 16 and the side end of the tank portion 17 is the tank portions 16, 1.
7 is transmitted to the contact wall portion 42 from the lower end, and the contact wall portion 42
From the inclined wall portion 43 to the bottom wall portion 44 to the drain hole 46, the water is guided to the drain port 7 and drained.

The condensed water that has flowed down between the two tank parts 16 and 17 to the lower end side of the tank parts 16 and 17 reaches the contact wall part 42 of the drainage case 4 before reaching the lower ends of the tank parts 16 and 17. The water merges with the condensed water from the side end that travels through and flows down to the inclined wall portion 43 side.

[Twelfth Embodiment] FIG. 25 shows a twelfth embodiment of the present invention.
It is a figure showing the structure of the example and showing the laminated refrigerant evaporator and the unit case.

In this embodiment, the shape of the bottom wall 6 of the unit case 2 is changed so that condensed water does not stay at the lower end of the refrigerant flow pipe 15. The bottom wall 6 of the unit case 2 is
The arc-shaped side wall portion 61 that closes the side ends of the two tank portions 16 and 17 of the refrigerant flow pipe 15 and the two side wall portions 61 that come into contact with the lowermost ends of the two tank portions 16 and 17 respectively. The contact wall portions 62, the two inclined wall portions 63 inclined downward from the inner end portions of these contact wall portions 62, and the lowermost ends of these inclined wall portions 63 are connected to each other, and The bottom wall portion 64 and the like are separated from the lowermost end by a predetermined distance.

[Modification] In the present embodiment, the present invention is used in the laminated refrigerant evaporator 3 in which the two tank portions 16 and 17 are formed at the lower end side of the refrigerant flow pipe 15, but the present invention is used as a refrigerant. It may be used for a refrigerant evaporator in which three or more tank parts are formed on the lower end side of the flow path pipe. Further, the present invention may be applied to a refrigerant evaporator having a tank portion at the upper end of the refrigerant flow pipe.

[0075]

The invention according to claim 1 and claim 11
The invention described in (3) efficiently discharges the condensed water generated on the surface of the refrigerant evaporator in which two tank parts are formed on the lower end side of the refrigerant flow pipe, and Since the condensed water does not stay, it is possible to suppress local corrosion on the lower end side of the refrigerant flow pipe.

According to the tenth aspect of the invention, the condensed water generated on the surface of the refrigerant evaporator in which the tank portion is formed at the lower end side of the refrigerant flow tube whose surface is hydrophilically treated is efficiently drained. As a result, the condensed water does not stay at the lowermost end of the tank portion that bulges outward from the other portion, so that local corrosion on the lower end side of the refrigerant flow pipe can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view showing a laminated refrigerant evaporator used in the first embodiment of the present invention.

FIG. 3 is a perspective view showing a laminated refrigerant evaporator and a drain case used in the first embodiment of the present invention.

FIG. 4 is an explanatory view showing a drainage principle of the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a drainage principle of the first comparative example.

FIG. 6 is an explanatory diagram showing a drainage principle of a second comparative example.

FIG. 7 is a graph showing experimental data of the first comparative example.

FIG. 8 is a graph showing experimental data of the first example of the present invention.

FIG. 9 is a perspective view showing a laminated refrigerant evaporator and a drain case used in a second embodiment of the present invention.

FIG. 10 is a sectional view showing a laminated refrigerant evaporator and a drain case used in a second embodiment of the present invention.

FIG. 11 is a sectional view showing a comparative example of the second embodiment of the present invention.

FIG. 12 is a sectional view showing a laminated refrigerant evaporator and a drain case used in a third embodiment of the present invention.

FIG. 13 is a perspective view showing a laminated refrigerant evaporator and a drain case used in a fourth embodiment of the present invention.

FIG. 14 is a perspective view showing a drainage case used in a fourth embodiment of the present invention.

FIG. 15 is a sectional view showing a drainage case used in a fourth embodiment of the present invention.

FIG. 16 is a sectional view showing a drainage case used in a fifth embodiment of the present invention.

FIG. 17 is a sectional view showing a drainage case used in a sixth embodiment of the present invention.

FIG. 18 is a sectional view showing a laminated refrigerant evaporator and a drain case used in a seventh embodiment of the present invention.

FIG. 19 is a sectional view showing a main part of an eighth embodiment of the present invention.

FIG. 20 is a perspective view showing a drainage case used in an eighth embodiment of the present invention.

FIG. 21 is a sectional view showing a main part of a ninth embodiment of the present invention.

FIG. 22 is a sectional view showing a main part of a tenth embodiment of the present invention.

FIG. 23 is a perspective view showing a laminated refrigerant evaporator and a drain case used in an eleventh embodiment of the present invention.

FIG. 24 is a sectional view showing a laminated refrigerant evaporator and a drain case used in an eleventh embodiment of the present invention.

FIG. 25 is a sectional view showing a laminated refrigerant evaporator and a unit case used in a twelfth embodiment of the present invention.

FIG. 26 is a cross-sectional view showing a cooling unit of an air conditioner using a conventional tank-top type refrigerant evaporator.

FIG. 27 is a cross-sectional view showing a cooling unit of an air conditioner using a conventional tank bottom type refrigerant evaporator.

FIG. 28 is a front view showing a conventional single tank type laminated refrigerant evaporator.

FIG. 29 is an explanatory diagram showing the principle of draining condensed water.

FIG. 30 is an explanatory diagram showing the principle of draining condensed water.

FIG. 31 is a sectional view showing a louver of a fin.

FIG. 32 is an explanatory view showing a condensed water retention portion in a refrigerant flow pipe of a conventional tank-top type refrigerant evaporator.

[Fig. 33] Fig. 33 is an explanatory view showing a condensate retention part in a refrigerant flow pipe of a conventional tank-under-placed refrigerant evaporator.

FIG. 34 is an explanatory diagram showing a condensate retention portion in a refrigerant flow pipe of a conventional tank-under-placed refrigerant evaporator.

[Explanation of symbols]

1 Cooling Unit of Air Conditioner for Automobile 2 Unit Case 3 Laminated Refrigerator Evaporator 4 Drainage Case (Induction Means) 7 Drainage Port 13 Refrigerant Channel Pipe 15 Refrigerant Channel Pipe 16 Tank Section 17 Tank Section 31 Side Wall Section 32 Outer Inclination Wall (windward side slanted portion, leeward side slanted portion) 33 projected wall (projected portion) 34 inner slanted wall 36 drainage hole (discharge hole)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Suehiro 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor Toshihiro Yamamoto 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nidec Incorporated (72) Inventor Sataya Nagasawa, 1-1, Showa-cho, Kariya, Aichi Prefecture, Nippon Denso Co., Ltd. (72) Inventor, Shogo Kaku, 1-1, Showa-cho, Kariya, Aichi Prefecture, Nihondenso Co., Ltd.

Claims (11)

[Claims] 1. A refrigerant evaporator comprising: (a) a plurality of refrigerant flow path pipes each having two tank portions formed on the lower end side thereof, and fins interposed between adjacent refrigerant flow paths; ) Located below this refrigerant evaporator, the windward sideward inclined portion that abuts the windward side end portions of the two tank portions, the leeward sideward inclined portion that abuts the leeward side end portions of the tank portions, A cooling unit for an air conditioner, comprising: a protruding portion that abuts a lower end portion of a portion between the two tank portions; and a drainage case having a discharge hole for draining condensed water generated in the refrigerant evaporator. . 2. The drainage case includes two side wall portions that come into contact with side edges on the windward side and side edges on the leeward side of the two tank portions, and the side wall portions are inclined downward from the side wall portions. Two outer inclined walls forming the windward sideward inclined portion and the leeward sideward inclined portion, and a V-shape that abuts the lower end portion of the site between the two tank portions to form the protruding portion. 2. The cooling unit for an air conditioner according to claim 1, wherein the cooling unit is formed of two protruding walls, and two inner inclined walls connecting the two outer inclined walls and the protruding wall. 3. The cooling unit for an air conditioner according to claim 2, wherein the discharge hole is formed in the inner inclined wall. 4. The drain case includes two side wall portions that come into contact with side edges on the windward side and side edges on the leeward side of the two tank portions, and the side wall portions are inclined downward from the side wall portions. Two inclined walls forming the windward sideward inclined portion and the leeward sideward inclined portion, and extending above a connecting portion of these inclined walls,
The cooling unit for an air conditioner according to claim 1, comprising a columnar wall that abuts a lower end portion of a portion between the individual tank portions and forms the protruding portion. 5. The drainage case includes two side wall portions that come into contact with the side edges on the windward side and the side edges on the leeward side of the two tank portions, and slopes downward from the side wall portions. Two slanted walls forming the windward side slanted portion and the leeward side slanted portion, and the lowermost ends of these slanted walls are connected to each other and separated from each other by a predetermined distance from the lower end portions of the two tank portions. A bottom wall portion, and a columnar wall that extends upward from the center of the bottom wall portion and that abuts the lower end portion of the portion between the two tank portions to form the protruding portion. The cooling unit for an air conditioner according to claim 1. 6. The cooling unit for an air conditioner according to claim 5, wherein the discharge hole is formed in the bottom wall portion. 7. The cooling of the air conditioner according to claim 1, wherein the molded plate and the fins of the refrigerant evaporator are subjected to hydrophilic treatment. unit. 8. The lower end of the interposition range of the fins interposed between the adjacent molding plates is lower than the upper end of the drain case.
The cooling unit for an air conditioner described in any one of 1. 9. The drain case is sandwiched between the lower end of the refrigerant evaporator and the bottom wall of the unit case, and the unit case has an engaging portion for positioning the drain case. The cooling unit for an air conditioner according to any one of claims 1 to 7. 10. A refrigerant evaporator having a tank portion bulging outward from the other portion on the lower end side of a refrigerant flow tube whose surface is hydrophilically treated, and condensed water below the refrigerant evaporator. And a unit case having a drainage port for draining the refrigerant evaporator, or one of the unit case, the condensed water from the bottom end of the tank portion or the lateral end of the tank portion to the drainage port. A cooling unit for an air conditioner having a guiding means for guiding. 11. Condensation generated in the refrigerant evaporator, which is arranged below a refrigerant evaporator formed by stacking a plurality of paired molding plates each having two tanks formed on the lower end side of the refrigerant flow pipe. A drainage case for draining water, which includes a windward sideward slant portion that abuts on windward end portions of the two tank portions, and a leeward side that abuts on leeward side end portions of the two tank portions. It has a lateral inclined part, a projecting part which abuts on a lower end part of the portion between the two tank parts, and a discharge hole for discharging condensed water generated in the refrigerant evaporator. Drainage case.